Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea
| Type | Article | ||||||||
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| Date | 2006-06 | ||||||||
| Language | English | ||||||||
| Author(s) | Fourre E1, Jean Baptiste P1, Charlou Jean-Luc2, Donval Jean-Pierre2, Ishibashi J3 | ||||||||
| Affiliation(s) | 1 : CEA Saclay, CEA, CNRS, UMR 1572,IPSL LSCE, F-91191 Gif Sur Yvette, France. 2 : IFREMER, DRO GM, Ctr Brest, F-29280 Plouzane, France. 3 : Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 8128581, Japan. |
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| Source | Geochemical Journal (0016-7002) (Terrapub), 2006-06 , Vol. 40 , N. 3 , P. 245-252 | ||||||||
| DOI | 10.2343/geochemj.40.245 | ||||||||
| WOS© Times Cited | 16 | ||||||||
| Keyword(s) | Western Pacific, Manus Basin, Back arc basins, Hydrothermal fluids, Helium isotopes | ||||||||
| Abstract | We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with He-3/He-4 values (7.4 to 7.9 R-a) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 +/- 0.1 R-a) are observed. The causal link between the narrow spatial extent of the He-3/He-4 anomaly at the MSC and a He-3-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity. | ||||||||
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